Apparatus and method for controlling hybrid electric vehicle including dual clutch transmission

Abstract

A method and an apparatus for controlling a hybrid electric vehicle are provided. The method includes: determining whether a coasting condition is satisfied and whether a current gear stage is greater than or equal to a predetermined gear stage; determining whether a brake pedal is pushed when the coasting condition is satisfied and the current gear stage is greater than or equal to the predetermined gear stage; determining whether deceleration of the hybrid electric vehicle is less than a predetermined deceleration when the brake pedal is pushed; connecting a speed gear to an output shaft when the deceleration of the hybrid electric vehicle is less than the predetermined deceleration; determining whether a shift condition before stopping from a current gear stage to a target gear stage is satisfied; and locking up a shift clutch when the shift condition before stopping is satisfied.

What is claimed is: 
     
       1. A method for controlling a hybrid electric vehicle including a dual clutch transmission, comprising:
 determining whether a coasting condition is satisfied and whether a current gear stage is greater than or equal to a predetermined gear stage; 
 determining whether a brake pedal is pushed when the coasting condition is satisfied and the current gear stage is greater than or equal to the predetermined gear stage; 
 determining whether deceleration of the hybrid electric vehicle is less than a predetermined deceleration when the brake pedal is pushed; 
 connecting a speed gear corresponding to a target gear stage to an output shaft corresponding to the target gear stage when the deceleration of the hybrid electric vehicle is less than the predetermined deceleration; 
 determining whether a shift condition before stopping from the current gear stage to the target gear stage is satisfied; and 
 locking up a shift clutch corresponding to the target gear stage when the shift condition before stopping is satisfied. 
 
     
     
       2. The method of  claim 1 , wherein whether the coasting condition is satisfied is determined based on a position value of an accelerator pedal, a position value of the brake pedal, and a speed of the hybrid electric vehicle. 
     
     
       3. The method of  claim 1 , further comprising not connecting the speed gear corresponding to the target gear stage to the output shaft corresponding to the target gear stage in a state in which the coasting condition is satisfied, the current gear stage is greater than or equal to the predetermined gear stage, and the brake pedal is not pushed. 
     
     
       4. The method of  claim 1 , wherein whether the shift condition before stopping is satisfied is determined based on a position value of an accelerator pedal, a speed of the hybrid electric vehicle, and the current gear stage. 
     
     
       5. An apparatus for controlling a hybrid electric vehicle, comprising:
 a driving motor configured to generate torque using electricity of a battery and generate the electricity by recovering braking energy or inertial energy when the hybrid electric vehicle is driven by braking or coasting; 
 a dual clutch transmission configured to be connected to the driving motor and including two shift clutches and a gear train; 
 a data detector configured to detect data for controlling the hybrid electric vehicle; and 
 a controller configured to control the dual clutch transmission based on the data, 
 wherein the controller determines whether a coasting condition is satisfied and whether a current gear stage is greater than or equal to a predetermined gear stage, 
 determines whether a brake pedal is pushed when the coasting condition is satisfied and the current gear stage is greater than or equal to the predetermined gear stage, 
 determines whether deceleration of the hybrid electric vehicle is less than a predetermined deceleration when the brake pedal is pushed, 
 connects a speed gear corresponding to a target gear stage to an output shaft corresponding to the target gear stage when the deceleration of the hybrid electric vehicle is less than the predetermined deceleration, 
 determines whether a shift condition before stopping from the current gear stage to the target gear stage is satisfied, and 
 locks up a shift clutch corresponding to the target gear stage when the shift condition before stopping is satisfied. 
 
     
     
       6. The apparatus of  claim 5 , wherein the controller determines whether the coasting condition is satisfied based on a position value of an accelerator pedal, a position value of the brake pedal, and a speed of the hybrid electric vehicle. 
     
     
       7. The apparatus of  claim 5 , wherein the controller does not connect the speed gear corresponding to the target gear stage to the output shaft corresponding to the target gear stage in a state in which the coasting condition is satisfied, the current gear stage is greater than or equal to the predetermined gear stage, and the brake pedal is not pushed. 
     
     
       8. The apparatus of  claim 5 , wherein the controller determines whether the shift condition before stopping is satisfied based on a position value of an accelerator pedal, a speed of the hybrid electric vehicle, and the current gear stage. 
     
     
       9. The apparatus of  claim 5 , wherein the data detector comprises:
 an accelerator pedal position detector configured to detect a position value of an accelerator pedal; 
 a brake pedal position detector configured to detect a position value of a brake pedal; 
 a vehicle speed detector configured to detect a speed of the hybrid electric vehicle; and 
 a gear stage detector configured to detect the current gear stage, 
 wherein the controller calculates the deceleration of the hybrid electric vehicle by differentiating the speed of the hybrid electric vehicle.